%0 Generic
%A Mandel, Torsten
%D 2014
%F heidok:17197
%R 10.11588/heidok.00017197
%T Quantum manipulation of (ultra-)cold atom  systems for information processing
%U https://archiv.ub.uni-heidelberg.de/volltextserver/17197/
%X Abstract  This work is split into two parts, in part one of this thesis we report on the improvement of the lifetime of a quantum memory based on neutral atoms while in part two we will focus on a new setup to perform experiments on neutral atoms within a 2D optical lattice. In the quantum memory experiment we used a blue-detuned optical dipole trap to confine the atoms in a minimum intensity region of the light beam, reducing dephasing due to differential light shift. We saw improvement in comparison to a previous experiment  using red-detuned dipole traps. The anticipated lifetime could not be reached, however. We observed oscillations of the retrievability of our stored state which we explain by the evolution of the transversal component of the spinwave using Monte-Carlo simulations. In the second part we report on our new setup, built to investigate a broad range of  experiments regarding 2D physics on optical lattices. This field is of special interest as it allows to simulate Hamiltonians of a wide range e.g. from solid state physics and opens possibilities regarding large-scale Entanglement/one-way computing. In particular we discuss 2D Mott-insulators, 2D-Bloch oscillation induced transport phenomena and ring-exchange in a superlattice plaquette.